Hessian2ObjectInput.readObject : hessian 反序列化空指針異常

java.lang.NullPointerException

at sun.reflect.GeneratedConstructorAccessor329.newInstance(Unknown Source)

at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)

at java.lang.reflect.Constructor.newInstance(Constructor.java:423)

at com.alibaba.com.caucho.hessian.io.JavaDeserializer.instantiate(JavaDeserializer.java:312)

at com.alibaba.com.caucho.hessian.io.JavaDeserializer.readObject(JavaDeserializer.java:201)

at com.alibaba.com.caucho.hessian.io.SerializerFactory.readObject(SerializerFactory.java:526)

at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObjectInstance(Hessian2Input.java:2810)

at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:2750)

at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:2279)

at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:2724)

at com.alibaba.com.caucho.hessian.io.Hessian2Input.readObject(Hessian2Input.java:2279)

at com.alibaba.dubbo.common.serialize.hessian2.Hessian2ObjectInput.readObject(Hessian2ObjectInput.java:84)

at com.alibaba.dubbo.rpc.protocol.dubbo.DecodeableRpcResult.decode(DecodeableRpcResult.java:92)

at com.alibaba.dubbo.rpc.protocol.dubbo.DecodeableRpcResult.decode(DecodeableRpcResult.java:113)

at com.alibaba.dubbo.rpc.protocol.dubbo.DubboCodec.decodeBody(DubboCodec.java:89)

at com.alibaba.dubbo.remoting.exchange.codec.ExchangeCodec.decode(ExchangeCodec.java:124)

at com.alibaba.dubbo.remoting.exchange.codec.ExchangeCodec.decode(ExchangeCodec.java:84)

at com.alibaba.dubbo.rpc.protocol.dubbo.DubboCountCodec.decode(DubboCountCodec.java:46)

at com.alibaba.dubbo.remoting.transport.netty.NettyCodecAdapter$InternalDecoder.messageReceived(NettyCodecAdapter.java:133)

at org.jboss.netty.channel.SimpleChannelUpstreamHandler.handleUpstream(SimpleChannelUpstreamHandler.java:75)

at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:565)

at org.jboss.netty.channel.DefaultChannelPipeline.sendUpstream(DefaultChannelPipeline.java:560)

at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:268)

at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:255)

at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:84)

at org.jboss.netty.channel.socket.nio.AbstractNioWorker.processSelectedKeys(AbstractNioWorker.java:465)

at org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:332)

at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:35)

at org.jboss.netty.util.ThreadRenamingRunnable.run(ThreadRenamingRunnable.java:102)

at org.jboss.netty.util.internal.DeadLockProofWorker$1.run(DeadLockProofWorker.java:42)

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

at java.lang.Thread.run(Thread.java:745)

問題描述：

dubbo服務在進行服務間的遠程調用時，通過hessain進行對象的序列化；出現了反序列化異常；

思路：

hessain反序列化異常有幾種場景：

1. 兩個jar中所引用的某個對象不是同一個導致，比如：對象A，之前有欄位 name,sex, 後面將A對象加入age欄位，而反序列化所在的服務中所引用的jar包還是舊的A對象，沒有age欄位，導致對象反序列化失敗（此種情況一般會直接提示那個對象反序列失敗）；

2. dubbo服務提供者和消費者版本不對，會導致反序列化失敗；類似於1；

3. 就是上面說的這種；調用其他的服務，被調用的服務底層出現了空指針異常，導致異常往上拋； 此時建議排查反序列化失敗的這個方法調用的方法棧，依次排查被調用的服務是否存在錯誤日誌；

純屬個人收集平時遇到的錯誤備份，也希望能幫助到大家

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